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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21dd7d641c5d31674eb31942a36319510a787ab4858c4131de2f9fbb28fe912a' 
  AND token = '9r6Ee6dfHv8bmZs1g1Zd2wPiTj3A8NalZ5npVBLLn4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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