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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f754288b0ef2b15b7546794a77b4875b33934715579b5bd6ea8f84c38606532' 
  AND token = 'uTr+gY/gK25Gar3ee0vldbvMUDypKov2/ks6FIypN0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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