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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc9797d3f9da23b15c547fcda0f76453d97a214c3a6f60899655f77046b42ad' 
  AND token = '8n+bw307yhihXOu0YasjfxtvMspqI6UQJXAULwtrUo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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