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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f2c96c9c45bb18a9c9a83a40a478382040f7e41c88a916b8e46046548f7175' 
  AND token = 'nM6tpJLC00YUlmdTI2L+gb9clokOUGNVMVNMNnhbPdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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