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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31dc2a6de968507e10562f7f1a806917927c2e62a82100b2f4382abbce9c52f4' 
  AND token = '3gSey/30zoU+8N3Vfvxmkbqt1xvJgkjEMCT6jjL3SBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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