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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d09eba267e0e9c9529c38792d8649a93342d12a9fa806855e3a280bdbd103f' 
  AND token = '6I/ebfbc3+u4fs1+xSbB3yIZlIGeFuYLgbXcrhWCTHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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