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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa3706746555d5c9f66744871a37da4c527773bbc1f15f8ce0de6e27f1859d8' 
  AND token = 'SsKlu566YnaChV2/3ZjXovo6PivT5lesmqExV61yCKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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