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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30f31799a8d12286c64a19f159348794a9d92e7924a6c8ec6d01c4ec4155a166' 
  AND token = 'fEVgXOMu6LGJBj22h0tB+1Sosak7fbxCCNmgwbNOEp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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