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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8b7171fff05eecbb95650c3ba685c7f387f80feca2de367f3fcaf401ed7e02' 
  AND token = 'gSna3LlJTtyht0ewcYKpcsMp/iPYmaHO7kSBsnj1xAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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