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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff752aa3a1b3f0d61b3d02cee78c2e24ff86614fad829c118af81cf84fca11ca' 
  AND token = '2Dlifx4tq6eiCj06nrQmrLWelPop7xA901ENNQ5i0rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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