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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f74aa1bacea97807c23d65de0ebd881d86a15aa8be24d5d8b4b856d98ff5c07' 
  AND token = 'xcONE7izKHXO8j6Yh2U1AoHqkaKlnPRfrgkNmR2Q9Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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