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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce0b5d2dcef4d2b9d371e19da5d3052dc1bc1e95cf6165ea1726597ba68c0e6' 
  AND token = 'uZPTSWdJwtFUk9ctj1AZFZDkCZjHqoMfrVTh8WR6XY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}