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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe77a4d1982e1f0c42c826b1a93ae8068b4ae27afb8ce0c49fe08d5d22d6e55' 
  AND token = 'Qbj186kQh8uxQJawvQdUoNO0HS/81bPJefBly5MXSWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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