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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60679c0bd99e98a0f5ff44b43a98e19cfad7130b6b672d608fe70aa6e6ff2023' 
  AND token = 'd4p6fBUZEJQnCplU+R0k9zJ/LfviQM6y9+oEE4CivDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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