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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6936f6b0b4c7a5216a421802d8fd8cbd2514e93f09b8d5d3968f6eaa9afd05a' 
  AND token = 'jlLVr1jZM+KstRIp24XXE55HR2w8KTaXFQsNJ3n0EyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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