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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '442b91c3975f7337835b5634fe3a81d54a6d1c25ad47ff200c5904216eeb4616' 
  AND token = 'dLiSV9xIMoOJMcDSUi+rAEhQP9nS4umOfjY1IcirzIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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