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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffb236e173c59db5d4f9ad8c07844261ec07314d45e70ffef983264c81f075e' 
  AND token = 'tzEcUCFxqdtf4o3djwK5+OU12e/FeRP9fRVvEp6llR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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