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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06edecb1aa67c7f0846dc8b87202ba4522d8c01df8e7e5b4dcbb301e5896d9a6' 
  AND token = 'sNwZYN0gpUTtYv99bHIb1+57P9BBR7a62+LMt/Byjxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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