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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbdf851c9feff9f3efdf019a034c8e1253a6e8dc16bfbff3585c6f1dfa13d59a' 
  AND token = 'K4OeOUb778+4Mdv0cShBEMlYcv2jFV4D7RY1Fv+BJE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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