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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc7c8048f77b5250ee6cb0cba461c6abcd8c36c9c118f0b41fb188614ddcb0e' 
  AND token = '92EEvvoJI7wO1f1+r/AiqFtwI9ccClqaI4R+WVKwREA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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