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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '782df8ac203d7c7c411cfa37291f439c8d8e1f660f5ef2a21bf9e846b5ebf2e1' 
  AND token = 'whlfw6m3ffpZ3s+QL2aq3kOHGNd/fMqMncCjW1Ax+Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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