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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e041b1a9e339862a06be4587545d3b2b7985ab8a2d416dcba6e7357302a6865b' 
  AND token = 'U5fC6XxdFPR2RbFzbJky+l5BXrplyW6y+6vT3+6OLGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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