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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8980d1edbb873e630c9fc4a72235d758dc245da94682e7c2dcbe1298547f8be5' 
  AND token = 'yhky3n6DpJAL+idUr0ksu2GqiFKr+M4t6q6onC+iry4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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