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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd08f363b2d0985effdd1addcd296493f26b75ef0cc62ae38d4f6875e48d1235f' 
  AND token = 'GS3BxkU9/H1s/D5Rt5ErQP7D34B4TQ1COPSYm//+g+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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