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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fce6b212baab3267d933fe2d9da66409bb8c8bb353846a4bb4cb0f512eaa569' 
  AND token = 'Wt+du1+r62jiSCZmjqRiL3LQjlTMuC5hfB0upiefetc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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