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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d5708a1fccf1c134d0748963f4957a9b4f237ba2d9488c0bacc09b4e8931f9' 
  AND token = 'sL1+lzO5fMQYzJA0FY2goHfDrIso7habw+S4h1USkso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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