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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038aeb964ea20d6a47db3ef8907fcb17839ad477dfd519bdbeae4bbf7434ab48' 
  AND token = '08G1f1rjcESaK1P/JbBUM/4vc8Cx3pC0K2G90sEXDig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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