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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38231aa53ba06593cce030b912e9a7a4ace49d00fc50935aa29d38071c4f8279' 
  AND token = 'T49al9c3PqkRpUABHaWn95HIWEhMMJIEoPwE0Ykod+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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