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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02019c1e7e030f1b237fd108dd3b5a0b0b64adc32210aed5591165fdc2e063e0' 
  AND token = 'bL6eR3jWAoFWEVlRqSoydZXSlBdS6q8Y+1Wv6RFFQ1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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