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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f398492e6c0295c4704ce3fb29d25b0be91b23372239c42f9fa5f29b1906e37b' 
  AND token = 'lWqjkBng/zbi3CiR0QGM2B37PBaKwSsn7/q1YQUF/B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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