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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084d2d2f712bb3cd550125b81ad88987cce51eb4ed2c1b466efd0b6e30a4ab21' 
  AND token = '12r63KSHHkV54QLOibJQmq1RLxj8Mne7tqzqaBFFtQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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