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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de40f0d300d34716f17392f2b156e07c9b2ffd6d624c0dfb765315cc04e03b7e' 
  AND token = 'zFj83Q6CoY996NW0glEqbdSofX994OR53376xCG/t78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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