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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00af06118526882eca2371b17182d1ae4e866be46be176d89b18a6abb6963f5' 
  AND token = 'ibDm5EbTe5BK5SELKBx6tQ4kCH72+P9f8zs6KTGephg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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