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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91efcb095a98d35251097107f4abd1954e238559074a7574048ce9ec9912f2d2' 
  AND token = '5x4bMkkVAzGU1fUu2Rhlo5yxbsNP+ILo9jo8fjUbep4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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