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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c6e174f2031c65f8c4684a34d92c8f8ce7416d4fa809649eee171c2e4e14d1' 
  AND token = '/EpSKzyYdgRevxxi3wxcpFOhosvSy0+KK1kir3VvJ2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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