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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655dc815aadf2d3cd1139bbf7827417067a9c3b3143a3539041dd42b2fc1f7f1' 
  AND token = 'yRKiRwSPEmi/m4m+HW8Ynk2hL4Plfk7DIhTwXn2Qdvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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