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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c852f020c01fd4bbe739bb6585a7925ddbc9c7a5912de982d628cdcddf56049' 
  AND token = 'a+lupkQRirlFqS02NjxR/P9lMspV5ij+UuD6t9Yz5lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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