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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f4a51690a3998df6374361995130877af41a07575ab9f9059a7bd7cbd352b5' 
  AND token = 'AzkiiXFU1idhMtDl5G/8FNMVqOhTaLQh8oojT+N6k6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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