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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ea2bf4d1f9d0ab417c6650944164c3d8fe525bada6e0311ad75a1d1239e9fd' 
  AND token = 'rfSaWl0m2KRxgVSkGS+rlIokUDeIe3ZpVTWupmL7HzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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