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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f391e2de586e65837d5652388d959780bda50710eea8861e548c8605e2d05e' 
  AND token = 'ZrX46WvbbHOJDz5Fgl5AlyJzOxDP18sB2T6W6Qupkqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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