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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48695e663e8158e714f15a6e0e8c65c321b95ade9c124836a0e6130b071cc1b' 
  AND token = 'DXl9Ua9lAVt1FoSJpwnA9o2BCQyYAO84IUmTQ+Oux80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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