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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848ab88963e7a6a3fb7567b3dedde9bd229ab12510f8252ce90daf472572c342' 
  AND token = '9sSB5P7/oJy/4Gn5X0dGxrlAElYeSlvS1GXHF7hjeXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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