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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9fb1c028c8d3533b9ff8171a7cd3a40ce9e9ce9805981a4a131c43d25e8092' 
  AND token = 'lDXG3L6RZ8ZRMf59oy1OrrP7HEldw48OEZLpFEf0Ink=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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