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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ba406d534da21094bc9d17ab0b5191a9f5dbb21c602902d78a279b029b040f' 
  AND token = '0tjtSdYT3ie71jxFK8zRuht7qZ+M413OsnBt/Ag6Q6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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