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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa9e30187991e8f5d154028cfaeed7230e6e80af03d9f3c4366813c24273c46' 
  AND token = 'gi/ro40/E96Ar154QmyyZ/PvfJNp/lZ0+mdAARnl/A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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