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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafd78c8047747ddb757fa65108f55add7f578402a0c86ca13c5322e7a2373bf' 
  AND token = 'EKtZHo6YNWID4t8emDkoIIxLJmuLMbGrfaE+cHiY8as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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