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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fb2fd87d30794a1b3f9d03b6180b7feddc64828573bf6546a15734e0b8c47d' 
  AND token = 'HRjs2RmnQBk2LkZ/dbuYZa/EXideuNmAy4XSnfkW5Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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