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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4164cdefae8a853f4acf2a93a2c9a546104ecfc19fe2825a8dfe2ebc6cd07e9' 
  AND token = 'jLy/53wv586qDdTKfSLeAJaqNJhkfV59pc45ZCSxEJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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