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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fe1815191ba96d2bfcaf25d85b18aec0daa15dc290e46dd47147d4ab7b4bd7' 
  AND token = 'ICkn9JIUkEqRekH2PbZ6v4foMv9SHic8dQKG5yjmScE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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