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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb725bf970b83e6f99499b3519e6c15d42c28ee614d94fe82c4859995dbb1ba' 
  AND token = 'cbl1nhEG8H90NsfkM1tLZgHI4LBhrEvnl1d+T7Bt2t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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