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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1241ac503e264c394aa121eb07c5b63b98fd50c59d5993fe0a2e716a7fd1723a' 
  AND token = 'RmGlSZHhtxhwWjgD9bT20U2eAG9zxHHO/RN8dXo26lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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