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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4873d81775d00e4a167a252de183291f7bcfa57768a9860542853b40a349da' 
  AND token = 'hOy1//de5M9C6D1ZcbUsgbBfeovL3wbHZPn9T4Ne27M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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