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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39640bad07ec84533e88399e8c0dbdeb3355b8fef77550885949432341f3375' 
  AND token = 'PhTA4J1xTQjSB2C4ECofrr2I3LqrNeTjnDvT4Xtzc4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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