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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc22528ae68bb9943878ab69cb9c7d526a6c63705fd62115c0120fadad2c796' 
  AND token = 'MRO9T/9CkNrplsy+byVysHlAGtK1gJKQYyc37p1wRqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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